I'm in that position as well. I've got loads of the little buggers and haven't got a clue what to do with them. So far I've got one being used to hold a small cleaning cloth in my bag (so it sits in the elastic which is there to hold the canisters) and that's about it. So, what else can they be used for? I've heard cat toys, I've also heard that they're good for storing cannabis in...

If I get really bored one day I may make myself a friend out of some. Using one canister for arms and legs (so that'll be four....), two for the body (the slim ends butting up against each other to form a waist) and the cap as a head (drawing a little face on it). I think I'll call him Billy.

Hmm... There must be something else to do. Something which won't have the men in white coats bashing down my door.

You could keep jewellery in em, coz I know you've got so much of that. Actually they'd be really good for keeping earings I reckon.
Or you could put shampoo in them for when you go camping.
Or put them in a tool kit to hold screws.